Hogsmeade Station

Gold Bricks

Gold Brick 1: Use Wingardium Leviosa on the clock to reveal this.

Students in Peril

Student in Peril 1: Use Hermione's bag on the right to reveal a crank. Use Wingardium Leviosa to place it on the machine, then turn it to reveal the student. 

Character Tokens

Luna (Overalls): Zap the chest by the pipe to reveal part of the pipe. use Wingardium Leviosa to repair it, then send a pet through to knock down a broom. Hop on it and ride it to the right, onto the roof where this is. You can purchase her for 50,000 studs.

Station Guard: Use Wingardium Leviosa to repair 5 lamps, revealing this. You can purchase him for 10,000 studs.

Red Power Bricks

Red Brick Detector: Use Dark Magic on the lock on the sign, then zap it to reveal this. You can purchase it for 250,000 studs.